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2205 Duplex Stainless Steel Pipe
Duplex 2205 is a two-phase, ferritic, austenitic, 22% chromium, 3% molybdenum, 5% to 6% nickel alloy stainless steel. It is the most widely used duplex stainless steel grade and is characterized by high yield strength, which is twice that of standard austenitic stainless steel grades. It also exhibits good fatigue strength and excellent resistance to stress corrosion, cracking, pitting, erosion and general corrosion in harsh environments.
2507 Duplex Stainless Steel Pipe
2507(UNS S32750) is an ultra-duplex stainless steel containing 25% chromium, 4% molybdenum and 7% nickel. It is designed for demanding applications that require excellent strength and corrosion resistance, such as chemical processes, petrochemicals and seawater equipment. The steel has excellent resistance to chloride stress corrosion cracking, high thermal conductivity and low coefficient of thermal expansion. High chromium, molybdenum and nickel levels provide excellent resistance to pitting, crevice corrosion and general corrosion.
202 stainless steel is an austenitic chromium-nickel-manganese alloy. It has high ductility, good corrosion resistance and excellent toughness in both high and low temperature environments. 202 stainless steel is one of the most widely used 200 series stainless steel. 202 stainless steel, the austenitic structure is stabilized by the addition of nickel and manganese, thereby preventing the formation of harmful phases, such as sigma phase or chromium carbide. The high nickel content also improves the corrosion and oxidation resistance of the steel at high temperatures.
303 grade stainless steel is also called 1.4305 stainless steel, and 303 grade is the easiest to process of all austenitic stainless steels. The machinability properties of the 303 grade are due to the presence of sulfur in the steel elements. Sulfur can improve machining, but it also reduces corrosion resistance and toughness. The corrosion resistance of the 303 type is lower than that of the 304 type, but the toughness is still as excellent as other austenitic grades.
317L is a low-carbon austenitic stainless steel containing molybdenum. More chromium, nickel and molybdenum are added to obtain better corrosion resistance and increase the resistance to sulfurous acid, acetic acid, formic acid, citric acid and tartaric acid. Resistance to chemical attack. Due to its low carbon content, 317L also provides resistance to sensitization during welding, as well as higher creep, rupture stress and high temperature tensile strength. It is non-magnetic in the annealed state, but may become slightly magnetic after welding.
321(UNS S32100) is a titanium stabilized austenitic stainless steel with good general corrosion resistance. It has good intergranular corrosion resistance at a chromium carbide precipitation temperature of 800-1500 °F(427-816°C). The alloy is resistant to oxidation at 1500 °F(816°C) and has higher creep and stress rupture properties than the 304 and 304L alloys. It also has good low temperature toughness.
330 is an austenitic nickel-chromium-iron-silicon alloy with excellent oxidation and carburizing properties up to 2200 °F and high strength. The high nickel and chromium content of the alloy provides excellent oxidation resistance and carburization, and the silicon content further improves the oxidation resistance of the alloy. The ultra-high nickel content of 34 to 37% of the alloy 330 also provides high resistance to chloride stress corrosion cracking and embrittlement due to sigma phase precipitation in most furnace atmospheres. The alloy 330 also has a low coefficient of expansion, excellent ductility and high strength.
347 is a stable austenitic chromium steel, containing niobium, which can eliminate carbide precipitation, thereby eliminating corrosion during the year. 347 is stabilized by the addition of chromium and tantalum, and provides higher creep and stress rupture properties than alloys 304 and 304L, which can also be used for sensitization and exposure to corrosion problems during the year. The addition of niobium also makes the 347 alloy have excellent corrosion resistance, even better than the 321 alloy.
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